Practice Problems
Description of Motion - Scalar vs Vector Quantities
Directions:
On this worksheet you will practice with the basic definitions of introductory motion.
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Question 1
A bike messenger traveled 3 blocks North, 7 blocks East, 6 blocks South, and finally 9 blocks West in order to deliver a package in the traffic, congested city. If his trip took 47 minutes, what was the magnitude of his average velocity in blocks/minute?
7.67 x 10
^{-2}
2.5 x 10
^{1}
1.06 x 10
^{-1}
3.61 x 10
^{0}
5.32 x 10
^{-1}
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Question 2
If the messenger in
Question #1
could have traveled directly to his destination, what would have been the direction of his net displacement?
123.7 deg
236.3 deg
146.3 deg
219.8 deg
140.2 deg
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Question 3
The magnitude of an object's average velocity can ONLY equal the magnitude of its average speed when the object is
traveling in successive
directions that change by 90º
traveling in a
straight line
standing still
traveling in a circle
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Question 4
A scalar is a quantity that can be completely described by stating its
direction
size
size and direction
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Question 5
A family taking a vacation traveled 7 hours at 65 mph and then 3 hours at only 49 mph. What was their average speed during this trip?
60.2 mph
53.6 mph
53.8 mph
57.0 mph
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Question 6
Which quantity is NOT a scalar?
time
acceleration
mass
distance
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Question 7
Which description of an object's motion is more specific: moving at a constant speed or moving at a constant velocity?
constant speed since it demands that the object
has to maintain a constant rate
regardless of its direction of motion
constant velocity since it demands that the object
not only move at a constant rate,
but also maintain a constant direction
the two terms are completely equivalent
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Question 8
A student warming up for practice travels one full circuit, 400 meters, around the track. Initially he jogs 94 meters at 1.5 m/sec, then runs 282 meters at 2.2 m/sec, and finally cools down by finishing the final 24 meters at 1.0 m/sec. What was his average speed?
2.35 m/sec
1.96 m/sec
1.86 m/sec
1.57 m/sec
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Question 9
What was the student's average velocity in
Question #8
?
0 m/sec
cannot be determined
the same as his average speed
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Question 10
During a 30 minute period of time, one car moves at a constant velocity of 45 mph, N, while a second car moves at a constant velocity of 45 mph, W. During this time interval, the cars would have the same
A. instantaneous speed
B. instantaneous velocity
C. displacement
D. acceleration
B and C
A and D
A and C
B and D
C and D
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Question 11
A moving van completes its journey of 705 kilometers in 9 hours. Approximately how far should it have traveled 5.5 hours after beginning its trip?
431 km
274 km
128 km
263 km
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